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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: AbstractIterationSet.html 602 2015-01-05 18:49:18Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.util;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.util.AbstractSet;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.util.ArrayList;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.Iterator;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.util.Set;<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>/**<a name="line.15"></a>
<span class="sourceLineNo">016</span> * Support superclass for {@link Set} implementations for which calculating {@link #size} requires<a name="line.16"></a>
<span class="sourceLineNo">017</span> * an iteration through all of the set's elements to count them.<a name="line.17"></a>
<span class="sourceLineNo">018</span> *<a name="line.18"></a>
<span class="sourceLineNo">019</span> * &lt;p&gt;<a name="line.19"></a>
<span class="sourceLineNo">020</span> * Superclass methods in {@link AbstractSet} that rely on {@link #size} are overridden with alternate<a name="line.20"></a>
<span class="sourceLineNo">021</span> * implementations that avoid the use of {@link #size} when possible.<a name="line.21"></a>
<span class="sourceLineNo">022</span> * &lt;/p&gt;<a name="line.22"></a>
<span class="sourceLineNo">023</span> *<a name="line.23"></a>
<span class="sourceLineNo">024</span> * &lt;p&gt;<a name="line.24"></a>
<span class="sourceLineNo">025</span> * For a read-only implementation, subclasses should implement {@link #contains contains()} and {@link #iterator iterator()}.<a name="line.25"></a>
<span class="sourceLineNo">026</span> * For a mutable implementation, subclasses should also implement {@link #add add()}, {@link #remove remove()},<a name="line.26"></a>
<span class="sourceLineNo">027</span> * and {@link #clear}, and make the {@link #iterator} mutable.<a name="line.27"></a>
<span class="sourceLineNo">028</span> * &lt;/p&gt;<a name="line.28"></a>
<span class="sourceLineNo">029</span> */<a name="line.29"></a>
<span class="sourceLineNo">030</span>public abstract class AbstractIterationSet&lt;E&gt; extends AbstractSet&lt;E&gt; {<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span>    protected AbstractIterationSet() {<a name="line.32"></a>
<span class="sourceLineNo">033</span>    }<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span>    /**<a name="line.35"></a>
<span class="sourceLineNo">036</span>     * Calculate size.<a name="line.36"></a>
<span class="sourceLineNo">037</span>     *<a name="line.37"></a>
<span class="sourceLineNo">038</span>     * &lt;p&gt;<a name="line.38"></a>
<span class="sourceLineNo">039</span>     * The implementation in {@link AbstractIterationSet} iterates through all of the elements.<a name="line.39"></a>
<span class="sourceLineNo">040</span>     * &lt;/p&gt;<a name="line.40"></a>
<span class="sourceLineNo">041</span>     */<a name="line.41"></a>
<span class="sourceLineNo">042</span>    @Override<a name="line.42"></a>
<span class="sourceLineNo">043</span>    public int size() {<a name="line.43"></a>
<span class="sourceLineNo">044</span>        int count = 0;<a name="line.44"></a>
<span class="sourceLineNo">045</span>        for (E elem : this)<a name="line.45"></a>
<span class="sourceLineNo">046</span>            count++;<a name="line.46"></a>
<span class="sourceLineNo">047</span>        return count;<a name="line.47"></a>
<span class="sourceLineNo">048</span>    }<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>    /**<a name="line.50"></a>
<span class="sourceLineNo">051</span>     * Overridden in {@link AbstractIterationSet} to minimize the use of {@link #size}.<a name="line.51"></a>
<span class="sourceLineNo">052</span>     */<a name="line.52"></a>
<span class="sourceLineNo">053</span>    @Override<a name="line.53"></a>
<span class="sourceLineNo">054</span>    public boolean equals(Object obj) {<a name="line.54"></a>
<span class="sourceLineNo">055</span>        if (obj == this)<a name="line.55"></a>
<span class="sourceLineNo">056</span>            return true;<a name="line.56"></a>
<span class="sourceLineNo">057</span>        if (!(obj instanceof Set))<a name="line.57"></a>
<span class="sourceLineNo">058</span>            return false;<a name="line.58"></a>
<span class="sourceLineNo">059</span>        final Set&lt;?&gt; that = (Set&lt;?&gt;)obj;<a name="line.59"></a>
<span class="sourceLineNo">060</span>        final Iterator&lt;?&gt; i1 = this.iterator();<a name="line.60"></a>
<span class="sourceLineNo">061</span>        final Iterator&lt;?&gt; i2 = that.iterator();<a name="line.61"></a>
<span class="sourceLineNo">062</span>        while (true) {<a name="line.62"></a>
<span class="sourceLineNo">063</span>            final boolean hasNext1 = i1.hasNext();<a name="line.63"></a>
<span class="sourceLineNo">064</span>            final boolean hasNext2 = i2.hasNext();<a name="line.64"></a>
<span class="sourceLineNo">065</span>            if (!hasNext1 &amp;&amp; !hasNext2)<a name="line.65"></a>
<span class="sourceLineNo">066</span>                return true;<a name="line.66"></a>
<span class="sourceLineNo">067</span>            if (!hasNext1 || !hasNext2)<a name="line.67"></a>
<span class="sourceLineNo">068</span>                return false;<a name="line.68"></a>
<span class="sourceLineNo">069</span>            if (!this.contains(i2.next()))<a name="line.69"></a>
<span class="sourceLineNo">070</span>                return false;<a name="line.70"></a>
<span class="sourceLineNo">071</span>            i1.next();<a name="line.71"></a>
<span class="sourceLineNo">072</span>        }<a name="line.72"></a>
<span class="sourceLineNo">073</span>    }<a name="line.73"></a>
<span class="sourceLineNo">074</span><a name="line.74"></a>
<span class="sourceLineNo">075</span>    // This is here to silence a checkstyle warning<a name="line.75"></a>
<span class="sourceLineNo">076</span>    @Override<a name="line.76"></a>
<span class="sourceLineNo">077</span>    public int hashCode() {<a name="line.77"></a>
<span class="sourceLineNo">078</span>        return super.hashCode();<a name="line.78"></a>
<span class="sourceLineNo">079</span>    }<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span>    /**<a name="line.81"></a>
<span class="sourceLineNo">082</span>     * Overridden in {@link AbstractIterationSet} to minimize the use of {@link #size}.<a name="line.82"></a>
<span class="sourceLineNo">083</span>     */<a name="line.83"></a>
<span class="sourceLineNo">084</span>    @Override<a name="line.84"></a>
<span class="sourceLineNo">085</span>    public boolean isEmpty() {<a name="line.85"></a>
<span class="sourceLineNo">086</span>        return !this.iterator().hasNext();<a name="line.86"></a>
<span class="sourceLineNo">087</span>    }<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span>    /**<a name="line.89"></a>
<span class="sourceLineNo">090</span>     * Overridden in {@link AbstractIterationSet} to minimize the use of {@link #size}.<a name="line.90"></a>
<span class="sourceLineNo">091</span>     */<a name="line.91"></a>
<span class="sourceLineNo">092</span>    @Override<a name="line.92"></a>
<span class="sourceLineNo">093</span>    public Object[] toArray() {<a name="line.93"></a>
<span class="sourceLineNo">094</span>        final ArrayList&lt;E&gt; list = new ArrayList&lt;&gt;();<a name="line.94"></a>
<span class="sourceLineNo">095</span>        for (E elem : this)<a name="line.95"></a>
<span class="sourceLineNo">096</span>            list.add(elem);<a name="line.96"></a>
<span class="sourceLineNo">097</span>       return list.toArray();<a name="line.97"></a>
<span class="sourceLineNo">098</span>    }<a name="line.98"></a>
<span class="sourceLineNo">099</span><a name="line.99"></a>
<span class="sourceLineNo">100</span>    /**<a name="line.100"></a>
<span class="sourceLineNo">101</span>     * Overridden in {@link AbstractIterationSet} to minimize the use of {@link #size}.<a name="line.101"></a>
<span class="sourceLineNo">102</span>     */<a name="line.102"></a>
<span class="sourceLineNo">103</span>    @Override<a name="line.103"></a>
<span class="sourceLineNo">104</span>    public &lt;T&gt; T[] toArray(T[] array) {<a name="line.104"></a>
<span class="sourceLineNo">105</span>        final ArrayList&lt;E&gt; list = new ArrayList&lt;&gt;();<a name="line.105"></a>
<span class="sourceLineNo">106</span>        for (E elem : this)<a name="line.106"></a>
<span class="sourceLineNo">107</span>            list.add(elem);<a name="line.107"></a>
<span class="sourceLineNo">108</span>       return list.toArray(array);<a name="line.108"></a>
<span class="sourceLineNo">109</span>    }<a name="line.109"></a>
<span class="sourceLineNo">110</span>}<a name="line.110"></a>
<span class="sourceLineNo">111</span><a name="line.111"></a>




























































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